What does the phrase like forty going north mean?

The phrase "like forty going north" is a slang term and doesn't have a literal meaning. It's used to describe something that is very fast or rapidly increasing.

Here's how it's used:

* "That car was going like forty going north!" This means the car was moving very quickly.

* "Prices are going up like forty going north!" This means prices are increasing rapidly.

The phrase is often used in a humorous or exaggerated way to emphasize the speed or rapid growth of something.

It's important to note that the phrase isn't widely used and might be considered regional slang.